Ketens undergo 2 + 2 cycloaddition to the CN bond of the imidoylazimines (1) to give the β-lactams (2) which are cleaved on heating to give either benzocinnoline and 1,2,4,4-tetrasubstituted imidazolin-5-ones (5) or the triazolines (7), depending on the keten substituents.

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Journal of the Chemical Society, Chemical Communications
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